package com.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.common.BaseContext;
import com.common.R;
import com.entity.ShoppingCart;
import com.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加到购物车
     */
    @PostMapping("/add")
    public R<ShoppingCart> save(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);
        //设置用户id，指定当前时哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if (dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //SQL:select * from shopping_cart where user_id = ? and dish_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null){
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 从购物车中减掉
     */
    @PostMapping("/sub")
    public R<String> remove(@RequestBody ShoppingCart shoppingCart){
        //设置用户id，指定当前时哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if (dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //SQL:select * from shopping_cart where user_id = ? and dish_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne.getNumber()>1){
            //如果已经存在，就在原来数量基础上减去一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);
        }else {

            shoppingCartService.remove(queryWrapper);
        }
        return R.success("减去成功");
    }

    /**
     * 查看购物车
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
//        //SQL:delete from shopping_cart where user_id = ?
//        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
//        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
//        shoppingCartService.remove(queryWrapper);
        shoppingCartService.clean();
        return R.success("清空购物车成功");
    }
}
